<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <div @mouseleave="moveOutDiv" @mouseenter="isShow=true" >
        <h2 class="all">全部商品分类</h2>
        <transition name="sort">
          <div class="sort"  v-show="isShow">
            <div class="all-sort-list2" @click="toSearch">
              <div
                  class="item "
                  :class="{item_on:currentIndex===index}"
                  @mouseenter="moveInItem(index)"
                  v-for="(c1,index) in categoryList "
                  :key="c1.categoryId"
              >
                <h3>
                  <!--                      <a href="">{{ c1.categoryName}}</a>-->
                  <!--第一种方式 声明时导航 需要建立多个组件对象占用内存 点击的时候卡-->
                  <!--                <router-link :to="{
                                    name:'search',
                                    query:{categoryName:c1.categoryName,category1Id:c1.categoryId}
                                  }">{{ c1.categoryName }}
                                  </router-link>-->
                  <!--第二种方式 编程式导航-->
                  <!--                <a @click="$router.push({-->
                  <!--                      name:'search',-->
                  <!--                      query: {categoryName:c1.categoryName,category1Id:c1.categoryId}-->
                  <!--                      })" href="javascript:;">{{ c1.categoryName }}</a>-->
                  <!--                第三种方式 事件委派-->
                  <a href="javascript:;" :data-categoryName="c1.categoryName" :data-category1Id="c1.categoryId">{{ c1.categoryName}}</a>
                </h3>
                <div class="item-list clearfix">
                  <div class="subitem">
                    <dl class="fore" v-for="(c2,index) in c1.categoryChild" :key="c2.categoryId">
                      <dt>
                        <!--                      <a href="">{{ c2.categoryName}}</a>-->
                        <!--                     第一种方式 声明式导航 -->
                        <!--                      <router-link :to="{
                                          name:'search',
                                          query:{categoryName:c2.categoryName,category2Id:c2.categoryId}
                                        }">{{c2.categoryName}}</router-link>-->
                        <!--第二种编程式导航-->
                        <!--                      <a @click="$router.push({-->
                        <!--                      name:'search',-->
                        <!--                      query: {categoryName:c2.categoryName,category2Id:c2.categoryId}-->
                        <!--                      })" href="javascript:;">{{ c2.categoryName }}</a>-->
                        <!--                      事件委派-->
                        <a href="javascript:;" :data-categoryName="c2.categoryName" :data-category2Id="c2.categoryId">{{ c2.categoryName}}</a>
                      </dt>
                      <dd>
                        <em v-for="(c3,index) in c2.categoryChild" :key="c3.categoryId">
                          <!--                        <a href="">{{ c3.categoryName}}</a>-->
                          <!--                        第一方式 声明式导航 -->
                          <!--                        <router-link :to="{-->
                          <!--                  name:'search',-->
                          <!--                  query:{categoryName:c3.categoryName,category3Id:c3.categoryId}-->
                          <!--                }">{{c3.categoryName}}</router-link>-->
                          <!--                        第二种方式编程式导航-->
                          <!--                        <a @click="$router.push({-->
                          <!--                      name:'search',-->
                          <!--                      query: {categoryName:c3.categoryName,category3Id:c3.categoryId}-->
                          <!--                      })" href="javascript:;">{{ c3.categoryName }}</a>-->
                          <!--                        第三种方式 事件委派-->
                          <a href="javascript:;" :data-categoryName="c3.categoryName" :data-category3Id="c3.categoryId">{{ c3.categoryName}}</a>
                        </em>

                      </dd>
                    </dl>
                  </div>
                </div>

              </div>
            </div>
          </div>
        </transition>
      </div>

      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>

    </div>
  </div>
</template>

<script>
import {mapState} from "vuex";
import throttle from "lodash/throttle";

export default {
  name: "TypeNav",
  data() {
    return {
      currentIndex: -1,
      isShow:true
    }
  },
  mounted() {
    //当组件挂载的时候判断路径是在home组件里还是在search组件中
    if (this.$route.path!=='/home'){
      this.isShow=false
    }
    //发送请求放在App组件中
  /*  this.getCategoryList()//已挂载的时候就调用*/
  },
  methods: {
    //发送请求放在App组件中
    // getCategoryList() {
    //   this.$store.dispatch('getCategoryList')
    // },
    //节流 throttle(参数1,参数2,参数3) 参数1:要节流的函数 参数2:平均时间执行一次,20-50毫秒之间,参数3:'trailing': false 拖延不执行
    moveInItem: throttle(
        function (index) {
          // console.log(index) 测试节流
          this.currentIndex = index
        }, 20, {'trailing': false}
    ),
    //用事件委派跳转路由到search
    toSearch(event){
      //获取dataset对象
      let dataset=event.target.dataset//收集data-开头的数据放入dataset中
      //注意 解构赋值出来全部都是小写 但是后端的接口文档中是驼峰命名
      const {categoryname,category1id,category2id,category3id}=dataset
      // console.log(dataset)
      if (categoryname){
        let location={
          name:'search'
        }
        //query携带categoryName,categoryId 不确定是携带那个id
        let query={
          categoryName:categoryname
        }

        if (category1id){
          query.category1Id=category1id
        }else if(category2id){
          query.category2Id=category2id
        }else {
          query.category3Id=category3id
        }
        location.query=query
        //判断点击三级分类时 判断是否传入了params参数 如果有要拼接到location中
        if (this.$route.params){
          location.params=this.$route.params
        }
        if(this.$route.path!=='/home'){
          this.$router.replace(location)
        }else {
          this.$router.push(location)
        }

        // console.log(location)
      }

    },
    //移出div
    moveOutDiv() {
      this.currentIndex = -1
      if (this.$route.path!=='/home'){
        this.isShow=false
      }
    }
  },
  computed: {
    ...mapState({
      categoryList: state => state.home.categoryList
    })
  }
}
</script>

<style lang="less" scoped>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;
      &.sort-enter{
        opacity:0;
        height:0 ;
      }
      &.sort-enter-active{
        transition: all 1s;
      }
      &.sort-enter-to{
        opacity:1;
        height:461px ;
      }
      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &.item_on {
            background: #bfa;

            .item-list {

              display: block;
            }
          }
        }
      }
    }
  }
}
</style>